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Grade (brand): Chemical Pure Techanical requirements Apperance : Orange powder Physical and Chemical properties 1. Lead Chromate Content, % ≥ 98 2. Nitride (counted by NO3),% ≤ 0.005 3.Carbon compound (counted by CO3), % ≤0.1 4. Soluble matter, % , ≤ 0.5 5. Burning time (25mm ammunition compound pan), s, 16-18